Debugger.cc

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#include "Debugger.hh"
#include "Debuggable.hh"
#include "ProbeBreakPoint.hh"
#include "MSXMotherBoard.hh"
#include "Reactor.hh"
#include "MSXCPU.hh"
#include "MSXCPUInterface.hh"
#include "BreakPoint.hh"
#include "DebugCondition.hh"
#include "MSXWatchIODevice.hh"
#include "TclObject.hh"
#include "CommandException.hh"
#include "MemBuffer.hh"
#include "ranges.hh"
#include "stl.hh"
#include "unreachable.hh"
#include "view.hh"
#include "xrange.hh"
#include <cassert>
#include <memory>
#include <stdexcept>

using std::shared_ptr;
using std::make_shared;
using std::string;
using std::vector;
using std::begin;
using std::end;

namespace openmsx {

Debugger::Debugger(MSXMotherBoard& motherBoard_)
        : motherBoard(motherBoard_)
        , cmd(motherBoard.getCommandController(),
              motherBoard.getStateChangeDistributor(),
              motherBoard.getScheduler())
        , cpu(nullptr)
{
}

Debugger::~Debugger()
{
        assert(!cpu);
        assert(debuggables.empty());
}

void Debugger::registerDebuggable(string name, Debuggable& debuggable)
{
        assert(!debuggables.contains(name));
        debuggables.emplace_noDuplicateCheck(std::move(name), &debuggable);
}

void Debugger::unregisterDebuggable(string_view name, Debuggable& debuggable)
{
        assert(debuggables.contains(name));
        assert(debuggables[name.str()] == &debuggable); (void)debuggable;
        debuggables.erase(name);
}

Debuggable* Debugger::findDebuggable(string_view name)
{
        auto v = lookup(debuggables, name);
        return v ? *v : nullptr;
}

Debuggable& Debugger::getDebuggable(string_view name)
{
        Debuggable* result = findDebuggable(name);
        if (!result) {
                throw CommandException("No such debuggable: ", name);
        }
        return *result;
}

void Debugger::registerProbe(ProbeBase& probe)
{
        assert(!probes.contains(probe.getName()));
        probes.insert_noDuplicateCheck(&probe);
}

void Debugger::unregisterProbe(ProbeBase& probe)
{
        assert(probes.contains(probe.getName()));
        probes.erase(probe.getName());
}

ProbeBase* Debugger::findProbe(string_view name)
{
        auto it = probes.find(name);
        return (it != end(probes)) ? *it : nullptr;
}

ProbeBase& Debugger::getProbe(string_view name)
{
        auto* result = findProbe(name);
        if (!result) {
                throw CommandException("No such probe: ", name);
        }
        return *result;
}

unsigned Debugger::insertProbeBreakPoint(
        TclObject command, TclObject condition,
        ProbeBase& probe, unsigned newId /*= -1*/)
{
        auto bp = std::make_unique<ProbeBreakPoint>(
                command, condition, *this, probe, newId);
        unsigned result = bp->getId();
        probeBreakPoints.push_back(std::move(bp));
        return result;
}

void Debugger::removeProbeBreakPoint(string_view name)
{
        if (name.starts_with("pp#")) {
                // remove by id
                try {
                        unsigned id = fast_stou(name.substr(3));
                        auto it = ranges::find_if(probeBreakPoints, [&](auto& bp) {
                                return bp->getId() == id;
                        });
                        if (it == end(probeBreakPoints)) {
                                throw CommandException("No such breakpoint: ", name);
                        }
                        move_pop_back(probeBreakPoints, it);
                } catch (std::invalid_argument&) {
                        // parse error in fast_stou()
                        throw CommandException("No such breakpoint: ", name);
                }
        } else {
                // remove by probe, only works for unconditional bp
                auto it = ranges::find_if(probeBreakPoints, [&](auto& bp) {
                        return bp->getProbe().getName() == name;
                });
                if (it == end(probeBreakPoints)) {
                        throw CommandException(
                                "No (unconditional) breakpoint for probe: ", name);
                }
                move_pop_back(probeBreakPoints, it);
        }
}

void Debugger::removeProbeBreakPoint(ProbeBreakPoint& bp)
{
        move_pop_back(probeBreakPoints, rfind_if_unguarded(probeBreakPoints,
                [&](ProbeBreakPoints::value_type& v) { return v.get() == &bp; }));
}

unsigned Debugger::setWatchPoint(TclObject command, TclObject condition,
                                 WatchPoint::Type type,
                                 unsigned beginAddr, unsigned endAddr,
                                 unsigned newId /*= -1*/)
{
        shared_ptr<WatchPoint> wp;
        if ((type == WatchPoint::READ_IO) || (type == WatchPoint::WRITE_IO)) {
                wp = make_shared<WatchIO>(
                        motherBoard, type, beginAddr, endAddr,
                        command, condition, newId);
        } else {
                wp = make_shared<WatchPoint>(
                        command, condition, type, beginAddr, endAddr, newId);
        }
        motherBoard.getCPUInterface().setWatchPoint(wp);
        return wp->getId();
}

void Debugger::transfer(Debugger& other)
{
        // Copy watchpoints to new machine.
        assert(motherBoard.getCPUInterface().getWatchPoints().empty());
        for (auto& wp : other.motherBoard.getCPUInterface().getWatchPoints()) {
                setWatchPoint(wp->getCommandObj(), wp->getConditionObj(),
                              wp->getType(),       wp->getBeginAddress(),
                              wp->getEndAddress(), wp->getId());
        }

        // Copy probes to new machine.
        assert(probeBreakPoints.empty());
        for (auto& bp : other.probeBreakPoints) {
                if (ProbeBase* probe = findProbe(bp->getProbe().getName())) {
                        insertProbeBreakPoint(bp->getCommandObj(),
                                              bp->getConditionObj(),
                                              *probe, bp->getId());
                }
        }

        // Breakpoints and conditions are (currently) global, so no need to
        // copy those.
}


// class Debugger::Cmd

static word getAddress(Interpreter& interp, span<const TclObject> tokens)
{
        if (tokens.size() < 3) {
                throw CommandException("Missing argument");
        }
        unsigned addr = tokens[2].getInt(interp);
        if (addr >= 0x10000) {
                throw CommandException("Invalid address");
        }
        return addr;
}

Debugger::Cmd::Cmd(CommandController& commandController_,
                   StateChangeDistributor& stateChangeDistributor_,
                   Scheduler& scheduler_)
        : RecordedCommand(commandController_, stateChangeDistributor_,
                          scheduler_, "debug")
{
}

bool Debugger::Cmd::needRecord(span<const TclObject> tokens) const
{
        // Note: it's crucial for security that only the write and write_block
        // subcommands are recorded and replayed. The 'set_bp' command for
        // example would allow to set a callback that can execute arbitrary Tcl
        // code. See comments in RecordedCommand for more details.
        if (tokens.size() < 2) return false;
        string_view subCmd = tokens[1].getString();
        return (subCmd == "write") || (subCmd == "write_block");
}

void Debugger::Cmd::execute(
        span<const TclObject> tokens, TclObject& result, EmuTime::param /*time*/)
{
        if (tokens.size() < 2) {
                throw CommandException("Missing argument");
        }
        string_view subCmd = tokens[1].getString();
        if (subCmd == "read") {
                read(tokens, result);
        } else if (subCmd == "read_block") {
                readBlock(tokens, result);
        } else if (subCmd == "write") {
                write(tokens, result);
        } else if (subCmd == "write_block") {
                writeBlock(tokens, result);
        } else if (subCmd == "size") {
                size(tokens, result);
        } else if (subCmd == "desc") {
                desc(tokens, result);
        } else if (subCmd == "list") {
                list(result);
        } else if (subCmd == "step") {
                debugger().motherBoard.getCPUInterface().doStep();
        } else if (subCmd == "cont") {
                debugger().motherBoard.getCPUInterface().doContinue();
        } else if (subCmd == "disasm") {
                debugger().cpu->disasmCommand(getInterpreter(), tokens, result);
        } else if (subCmd == "break") {
                debugger().motherBoard.getCPUInterface().doBreak();
        } else if (subCmd == "breaked") {
                result = debugger().motherBoard.getCPUInterface().isBreaked();
        } else if (subCmd == "set_bp") {
                setBreakPoint(tokens, result);
        } else if (subCmd == "remove_bp") {
                removeBreakPoint(tokens, result);
        } else if (subCmd == "list_bp") {
                listBreakPoints(tokens, result);
        } else if (subCmd == "set_watchpoint") {
                setWatchPoint(tokens, result);
        } else if (subCmd == "remove_watchpoint") {
                removeWatchPoint(tokens, result);
        } else if (subCmd == "list_watchpoints") {
                listWatchPoints(tokens, result);
        } else if (subCmd == "set_condition") {
                setCondition(tokens, result);
        } else if (subCmd == "remove_condition") {
                removeCondition(tokens, result);
        } else if (subCmd == "list_conditions") {
                listConditions(tokens, result);
        } else if (subCmd == "probe") {
                probe(tokens, result);
        } else {
                throw SyntaxError();
        }
}

void Debugger::Cmd::list(TclObject& result)
{
        result.addListElements(view::keys(debugger().debuggables));
}

void Debugger::Cmd::desc(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 3) {
                throw SyntaxError();
        }
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        result = device.getDescription();
}

void Debugger::Cmd::size(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 3) {
                throw SyntaxError();
        }
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        result = device.getSize();
}

void Debugger::Cmd::read(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 4) {
                throw SyntaxError();
        }
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned addr = tokens[3].getInt(getInterpreter());
        if (addr >= device.getSize()) {
                throw CommandException("Invalid address");
        }
        result = device.read(addr);
}

void Debugger::Cmd::readBlock(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 5) {
                throw SyntaxError();
        }
        auto& interp = getInterpreter();
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned devSize = device.getSize();
        unsigned addr = tokens[3].getInt(interp);
        if (addr >= devSize) {
                throw CommandException("Invalid address");
        }
        unsigned num = tokens[4].getInt(interp);
        if (num > (devSize - addr)) {
                throw CommandException("Invalid size");
        }

        MemBuffer<byte> buf(num);
        for (unsigned i = 0; i < num; ++i) {
                buf[i] = device.read(addr + i);
        }
        result = span<byte>{buf.data(), num};
}

void Debugger::Cmd::write(span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 5) {
                throw SyntaxError();
        }
        auto& interp = getInterpreter();
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned addr = tokens[3].getInt(interp);
        if (addr >= device.getSize()) {
                throw CommandException("Invalid address");
        }
        unsigned value = tokens[4].getInt(interp);
        if (value >= 256) {
                throw CommandException("Invalid value");
        }

        device.write(addr, value);
}

void Debugger::Cmd::writeBlock(span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 5) {
                throw SyntaxError();
        }
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned devSize = device.getSize();
        unsigned addr = tokens[3].getInt(getInterpreter());
        if (addr >= devSize) {
                throw CommandException("Invalid address");
        }
        auto buf = tokens[4].getBinary();
        if ((buf.size() + addr) > devSize) {
                throw CommandException("Invalid size");
        }

        for (auto i : xrange(buf.size())) {
                device.write(unsigned(addr + i), buf[i]);
        }
}

void Debugger::Cmd::setBreakPoint(span<const TclObject> tokens, TclObject& result)
{
        TclObject command("debug break");
        TclObject condition;

        switch (tokens.size()) {
        case 5: // command
                command = tokens[4];
                // fall-through
        case 4: // condition
                condition = tokens[3];
                // fall-through
        case 3: { // address
                word addr = getAddress(getInterpreter(), tokens);
                BreakPoint bp(addr, command, condition);
                result = strCat("bp#", bp.getId());
                debugger().motherBoard.getCPUInterface().insertBreakPoint(bp);
                break;
        }
        default:
                if (tokens.size() < 3) {
                        throw CommandException("Too few arguments.");
                } else {
                        throw CommandException("Too many arguments.");
                }
        }
}

void Debugger::Cmd::removeBreakPoint(
        span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 3) {
                throw SyntaxError();
        }
        auto& interface = debugger().motherBoard.getCPUInterface();
        auto& breakPoints = interface.getBreakPoints();

        string_view tmp = tokens[2].getString();
        if (tmp.starts_with("bp#")) {
                // remove by id
                try {
                        unsigned id = fast_stou(tmp.substr(3));
                        auto it = ranges::find_if(breakPoints, [&](auto& bp) {
                                return bp.getId() == id;
                        });
                        if (it == end(breakPoints)) {
                                throw CommandException("No such breakpoint: ", tmp);
                        }
                        interface.removeBreakPoint(*it);
                } catch (std::invalid_argument&) {
                        // parse error in fast_stou()
                        throw CommandException("No such breakpoint: ", tmp);
                }
        } else {
                // remove by addr, only works for unconditional bp
                word addr = getAddress(getInterpreter(), tokens);
                auto range = ranges::equal_range(breakPoints, addr, CompareBreakpoints());
                auto it = std::find_if(range.first, range.second, [&](auto& bp) {
                        return bp.getCondition().empty();
                });
                if (it == range.second) {
                        throw CommandException(
                                "No (unconditional) breakpoint at address: ", tmp);
                }
                interface.removeBreakPoint(*it);
        }
}

void Debugger::Cmd::listBreakPoints(
        span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (auto& bp : interface.getBreakPoints()) {
                TclObject line;
                line.addListElement(strCat("bp#", bp.getId()));
                line.addListElement(strCat("0x", hex_string<4>(bp.getAddress())));
                line.addListElement(bp.getCondition());
                line.addListElement(bp.getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}


void Debugger::Cmd::setWatchPoint(span<const TclObject> tokens, TclObject& result)
{
        TclObject command("debug break");
        TclObject condition;
        unsigned beginAddr, endAddr;
        WatchPoint::Type type;

        switch (tokens.size()) {
        case 6: // command
                command = tokens[5];
                // fall-through
        case 5: // condition
                condition = tokens[4];
                // fall-through
        case 4: { // address + type
                string_view typeStr = tokens[2].getString();
                unsigned max;
                if (typeStr == "read_io") {
                        type = WatchPoint::READ_IO;
                        max = 0x100;
                } else if (typeStr == "write_io") {
                        type = WatchPoint::WRITE_IO;
                        max = 0x100;
                } else if (typeStr == "read_mem") {
                        type = WatchPoint::READ_MEM;
                        max = 0x10000;
                } else if (typeStr == "write_mem") {
                        type = WatchPoint::WRITE_MEM;
                        max = 0x10000;
                } else {
                        throw CommandException("Invalid type: ", typeStr);
                }
                auto& interp = getInterpreter();
                if (tokens[3].getListLength(interp) == 2) {
                        beginAddr = tokens[3].getListIndex(interp, 0).getInt(interp);
                        endAddr   = tokens[3].getListIndex(interp, 1).getInt(interp);
                        if (endAddr < beginAddr) {
                                throw CommandException(
                                        "Not a valid range: end address may "
                                        "not be smaller than begin address.");
                        }
                } else {
                        beginAddr = endAddr = tokens[3].getInt(interp);
                }
                if (endAddr >= max) {
                        throw CommandException("Invalid address: out of range");
                }
                break;
        }
        default:
                if (tokens.size() < 4) {
                        throw CommandException("Too few arguments.");
                } else {
                        throw CommandException("Too many arguments.");
                }
        }
        unsigned id = debugger().setWatchPoint(
                command, condition, type, beginAddr, endAddr);
        result = strCat("wp#", id);
}

void Debugger::Cmd::removeWatchPoint(
        span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 3) {
                throw SyntaxError();
        }
        string_view tmp = tokens[2].getString();
        try {
                if (tmp.starts_with("wp#")) {
                        // remove by id
                        unsigned id = fast_stou(tmp.substr(3));
                        auto& interface = debugger().motherBoard.getCPUInterface();
                        for (auto& wp : interface.getWatchPoints()) {
                                if (wp->getId() == id) {
                                        interface.removeWatchPoint(wp);
                                        return;
                                }
                        }
                }
        } catch (std::invalid_argument&) {
                // parse error in fast_stou()
        }
        throw CommandException("No such watchpoint: ", tmp);
}

void Debugger::Cmd::listWatchPoints(
        span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (auto& wp : interface.getWatchPoints()) {
                TclObject line;
                line.addListElement(strCat("wp#", wp->getId()));
                string type;
                switch (wp->getType()) {
                case WatchPoint::READ_IO:
                        type = "read_io";
                        break;
                case WatchPoint::WRITE_IO:
                        type = "write_io";
                        break;
                case WatchPoint::READ_MEM:
                        type = "read_mem";
                        break;
                case WatchPoint::WRITE_MEM:
                        type = "write_mem";
                        break;
                default:
                        UNREACHABLE; break;
                }
                line.addListElement(type);
                unsigned beginAddr = wp->getBeginAddress();
                unsigned endAddr   = wp->getEndAddress();
                if (beginAddr == endAddr) {
                        line.addListElement(strCat("0x", hex_string<4>(beginAddr)));
                } else {
                        TclObject range;
                        range.addListElement(strCat("0x", hex_string<4>(beginAddr)));
                        range.addListElement(strCat("0x", hex_string<4>(endAddr)));
                        line.addListElement(range);
                }
                line.addListElement(wp->getCondition());
                line.addListElement(wp->getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}


void Debugger::Cmd::setCondition(span<const TclObject> tokens, TclObject& result)
{
        TclObject command("debug break");
        TclObject condition;

        switch (tokens.size()) {
        case 4: // command
                command = tokens[3];
                // fall-through
        case 3: { // condition
                condition = tokens[2];
                DebugCondition dc(command, condition);
                result = strCat("cond#", dc.getId());
                debugger().motherBoard.getCPUInterface().setCondition(dc);
                break;
        }
        default:
                if (tokens.size() < 3) {
                        throw CommandException("Too few arguments.");
                } else {
                        throw CommandException("Too many arguments.");
                }
        }
}

void Debugger::Cmd::removeCondition(
        span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 3) {
                throw SyntaxError();
        }

        string_view tmp = tokens[2].getString();
        try {
                if (tmp.starts_with("cond#")) {
                        // remove by id
                        unsigned id = fast_stou(tmp.substr(5));
                        auto& interface = debugger().motherBoard.getCPUInterface();
                        for (auto& c : interface.getConditions()) {
                                if (c.getId() == id) {
                                        interface.removeCondition(c);
                                        return;
                                }
                        }
                }
        } catch (std::invalid_argument&) {
                // parse error in fast_stou()
        }
        throw CommandException("No such condition: ", tmp);
}

void Debugger::Cmd::listConditions(
        span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (auto& c : interface.getConditions()) {
                TclObject line;
                line.addListElement(strCat("cond#", c.getId()));
                line.addListElement(c.getCondition());
                line.addListElement(c.getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}


void Debugger::Cmd::probe(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() < 3) {
                throw CommandException("Missing argument");
        }
        string_view subCmd = tokens[2].getString();
        if (subCmd == "list") {
                probeList(tokens, result);
        } else if (subCmd == "desc") {
                probeDesc(tokens, result);
        } else if (subCmd == "read") {
                probeRead(tokens, result);
        } else if (subCmd == "set_bp") {
                probeSetBreakPoint(tokens, result);
        } else if (subCmd == "remove_bp") {
                probeRemoveBreakPoint(tokens, result);
        } else if (subCmd == "list_bp") {
                probeListBreakPoints(tokens, result);
        } else {
                throw SyntaxError();
        }
}
void Debugger::Cmd::probeList(span<const TclObject> /*tokens*/, TclObject& result)
{
        result.addListElements(view::transform(debugger().probes,
                [](auto* p) { return p->getName(); }));
}
void Debugger::Cmd::probeDesc(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 4) {
                throw SyntaxError();
        }
        result = debugger().getProbe(tokens[3].getString()).getDescription();
}
void Debugger::Cmd::probeRead(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() != 4) {
                throw SyntaxError();
        }
        result = debugger().getProbe(tokens[3].getString()).getValue();
}
void Debugger::Cmd::probeSetBreakPoint(
        span<const TclObject> tokens, TclObject& result)
{
        TclObject command("debug break");
        TclObject condition;
        ProbeBase* p;

        switch (tokens.size()) {
        case 6: // command
                command = tokens[5];
                // fall-through
        case 5: // condition
                condition = tokens[4];
                // fall-through
        case 4: { // probe
                p = &debugger().getProbe(tokens[3].getString());
                break;
        }
        default:
                if (tokens.size() < 4) {
                        throw CommandException("Too few arguments.");
                } else {
                        throw CommandException("Too many arguments.");
                }
        }

        unsigned id = debugger().insertProbeBreakPoint(command, condition, *p);
        result = strCat("pp#", id);
}
void Debugger::Cmd::probeRemoveBreakPoint(
        span<const TclObject> tokens, TclObject& /*result*/)
{
        if (tokens.size() != 4) {
                throw SyntaxError();
        }
        debugger().removeProbeBreakPoint(tokens[3].getString());
}
void Debugger::Cmd::probeListBreakPoints(
        span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        for (auto& p : debugger().probeBreakPoints) {
                TclObject line;
                line.addListElement(strCat("pp#", p->getId()));
                line.addListElement(p->getProbe().getName());
                line.addListElement(p->getCondition());
                line.addListElement(p->getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}

string Debugger::Cmd::help(const vector<string>& tokens) const
{
        static const string generalHelp =
                "debug <subcommand> [<arguments>]\n"
                "  Possible subcommands are:\n"
                "    list              returns a list of all debuggables\n"
                "    desc              returns a description of this debuggable\n"
                "    size              returns the size of this debuggable\n"
                "    read              read a byte from a debuggable\n"
                "    write             write a byte to a debuggable\n"
                "    read_block        read a whole block at once\n"
                "    write_block       write a whole block at once\n"
                "    set_bp            insert a new breakpoint\n"
                "    remove_bp         remove a certain breakpoint\n"
                "    list_bp           list the active breakpoints\n"
                "    set_watchpoint    insert a new watchpoint\n"
                "    remove_watchpoint remove a certain watchpoint\n"
                "    list_watchpoints  list the active watchpoints\n"
                "    set_condition     insert a new condition\n"
                "    remove_condition  remove a certain condition\n"
                "    list_conditions   list the active conditions\n"
                "    probe             probe related subcommands\n"
                "    cont              continue execution after break\n"
                "    step              execute one instruction\n"
                "    break             break CPU at current position\n"
                "    breaked           query CPU breaked status\n"
                "    disasm            disassemble instructions\n"
                "  The arguments are specific for each subcommand.\n"
                "  Type 'help debug <subcommand>' for help about a specific subcommand.\n";

        static const string listHelp =
                "debug list\n"
                "  Returns a list with the names of all 'debuggables'.\n"
                "  These names are used in other debug subcommands.\n";
        static const string descHelp =
                "debug desc <name>\n"
                "  Returns a description for the debuggable with given name.\n";
        static const string sizeHelp =
                "debug size <name>\n"
                "  Returns the size (in bytes) of the debuggable with given name.\n";
        static const string readHelp =
                "debug read <name> <addr>\n"
                "  Read a byte at offset <addr> from the given debuggable.\n"
                "  The offset must be smaller than the value returned from the "
                "'size' subcommand\n"
                "  Note that openMSX comes with a bunch of Tcl scripts that make "
                "some of the debug reads much more convenient (e.g. reading from "
                "Z80 or VDP registers). See the Console Command Reference for more "
                "details about these.\n";
        static const string writeHelp =
                "debug write <name> <addr> <val>\n"
                "  Write a byte to the given debuggable at a certain offset.\n"
                "  The offset must be smaller than the value returned from the "
                "'size' subcommand\n";
        static const string readBlockHelp =
                "debug read_block <name> <addr> <size>\n"
                "  Read a whole block at once. This is equivalent with repeated "
                "invocations of the 'read' subcommand, but using this subcommand "
                "may be faster. The result is a Tcl binary string (see Tcl manual).\n"
                "  The block is specified as size/offset in the debuggable. The "
                "complete block must fit in the debuggable (see the 'size' "
                "subcommand).\n";
        static const string writeBlockHelp =
                "debug write_block <name> <addr> <values>\n"
                "  Write a whole block at once. This is equivalent with repeated "
                "invocations of the 'write' subcommand, but using this subcommand "
                "may be faster. The <values> argument must be a Tcl binary string "
                "(see Tcl manual).\n"
                "  The block has a size and an offset in the debuggable. The "
                "complete block must fit in the debuggable (see the 'size' "
                "subcommand).\n";
        static const string setBpHelp =
                "debug set_bp <addr> [<cond>] [<cmd>]\n"
                "  Insert a new breakpoint at given address. When the CPU is about "
                "to execute the instruction at this address, execution will be "
                "breaked. At least this is the default behaviour, see next "
                "paragraphs.\n"
                "  Optionally you can specify a condition. When the CPU reaches "
                "the breakpoint this condition is evaluated, only when the condition "
                "evaluated to true execution will be breaked.\n"
                "  A condition must be specified as a Tcl expression. For example\n"
                "     debug set_bp 0xf37d {[reg C] == 0x2F}\n"
                "  This breaks on address 0xf37d but only when Z80 register C has the "
                "value 0x2F.\n"
                "  Also optionally you can specify a command that should be "
                "executed when the breakpoint is reached (and condition is true). "
                "By default this command is 'debug break'.\n"
                "  The result of this command is a breakpoint ID. This ID can "
                "later be used to remove this breakpoint again.\n";
        static const string removeBpHelp =
                "debug remove_bp <id>\n"
                "  Remove the breakpoint with given ID again. You can use the "
                "'list_bp' subcommand to see all valid IDs.\n";
        static const string listBpHelp =
                "debug list_bp\n"
                "  Lists all active breakpoints. The result is printed in 4 "
                "columns. The first column contains the breakpoint ID. The "
                "second one has the address. The third has the condition "
                "(default condition is empty). And the last column contains "
                "the command that will be executed (default is 'debug break').\n";
        static const string setWatchPointHelp =
                "debug set_watchpoint <type> <region> [<cond>] [<cmd>]\n"
                "  Insert a new watchpoint of given type on the given region, "
                "there can be an optional condition and alternative command. See "
                "the 'set_bp' subcommand for details about these last two.\n"
                "  Type must be one of the following:\n"
                "    read_io    break when CPU reads from given IO port(s)\n"
                "    write_io   break when CPU writes to given IO port(s)\n"
                "    read_mem   break when CPU reads from given memory location(s)\n"
                "    write_mem  break when CPU writes to given memory location(s)\n"
                "  Region is either a single value, this corresponds to a single "
                "memory location or IO port. Otherwise region must be a list of "
                "two values (enclosed in braces) that specify a begin and end "
                "point of a whole memory region or a range of IO ports.\n"
                "During the execution of <cmd>, the following global Tcl "
                "variables are set:\n"
                "  ::wp_last_address   this is the actual address of the mem/io "
                "read/write that triggered the watchpoint\n"
                "  ::wp_last_value     this is the actual value that was written "
                "by the mem/io write that triggered the watchpoint\n"
                "Examples:\n"
                "  debug set_watchpoint write_io 0x99 {[reg A] == 0x81}\n"
                "  debug set_watchpoint read_mem {0xfbe5 0xfbef}\n";
        static const string removeWatchPointHelp =
                "debug remove_watchpoint <id>\n"
                "  Remove the watchpoint with given ID again. You can use the "
                "'list_watchpoints' subcommand to see all valid IDs.\n";
        static const string listWatchPointsHelp =
                "debug list_watchpoints\n"
                "  Lists all active watchpoints. The result is similar to the "
                "'list_bp' subcommand, but there is an extra column (2nd column) "
                "that contains the type of the watchpoint.\n";
        static const string setCondHelp =
                "debug set_condition <cond> [<cmd>]\n"
                "  Insert a new condition. These are much like breakpoints, "
                "except that they are checked before every instruction "
                "(breakpoints are tied to a specific address).\n"
                "  Conditions will slow down simulation MUCH more than "
                "breakpoints. So only use them when you don't care about "
                "simulation speed (when you're debugging this is usually not "
                "a problem).\n"
                "  See 'help debug set_bp' for more details.\n";
        static const string removeCondHelp =
                "debug remove_condition <id>\n"
                "  Remove the condition with given ID again. You can use the "
                "'list_conditions' subcommand to see all valid IDs.\n";
        static const string listCondHelp =
                "debug list_conditions\n"
                "  Lists all active conditions. The result is similar to the "
                "'list_bp' subcommand, but without the 2nd column that would "
                "show the address.\n";
        static const string probeHelp =
                "debug probe <subcommand> [<arguments>]\n"
                "  Possible subcommands are:\n"
                "    list                             returns a list of all probes\n"
                "    desc   <probe>                   returns a description of this probe\n"
                "    read   <probe>                   returns the current value of this probe\n"
                "    set_bp <probe> [<cond>] [<cmd>]  set a breakpoint on the given probe\n"
                "    remove_bp <id>                   remove the given breakpoint\n"
                "    list_bp                          returns a list of breakpoints that are set on probes\n";
        static const string contHelp =
                "debug cont\n"
                "  Continue execution after CPU was breaked.\n";
        static const string stepHelp =
                "debug step\n"
                "  Execute one instruction. This command is only meaningful in "
                "break mode.\n";
        static const string breakHelp =
                "debug break\n"
                "  Immediately break CPU execution. When CPU was already breaked "
                "this command has no effect.\n";
        static const string breakedHelp =
                "debug breaked\n"
                "  Query the CPU breaked status. Returns '1' when CPU was "
                "breaked, '0' otherwise.\n";
        static const string disasmHelp =
                "debug disasm <addr>\n"
                "  Disassemble the instruction at the given address. The result "
                "is a Tcl list. The first element in the list contains a textual "
                "representation of the instruction, the next elements contain the "
                "bytes that make up this instruction (thus the length of the "
                "resulting list can be used to derive the number of bytes in the "
                "instruction).\n"
                "  Note that openMSX comes with a 'disasm' Tcl script that is much "
                "more convenient to use than this subcommand.";
        static const string unknownHelp =
                "Unknown subcommand, use 'help debug' to see a list of valid "
                "subcommands.\n";

        if (tokens.size() == 1) {
                return generalHelp;
        } else if (tokens[1] == "list") {
                return listHelp;
        } else if (tokens[1] == "desc") {
                return descHelp;
        } else if (tokens[1] == "size") {
                return sizeHelp;
        } else if (tokens[1] == "read") {
                return readHelp;
        } else if (tokens[1] == "write") {
                return writeHelp;
        } else if (tokens[1] == "read_block") {
                return readBlockHelp;
        } else if (tokens[1] == "write_block") {
                return writeBlockHelp;
        } else if (tokens[1] == "set_bp") {
                return setBpHelp;
        } else if (tokens[1] == "remove_bp") {
                return removeBpHelp;
        } else if (tokens[1] == "list_bp") {
                return listBpHelp;
        } else if (tokens[1] == "set_watchpoint") {
                return setWatchPointHelp;
        } else if (tokens[1] == "remove_watchpoint") {
                return removeWatchPointHelp;
        } else if (tokens[1] == "list_watchpoints") {
                return listWatchPointsHelp;
        } else if (tokens[1] == "set_condition") {
                return setCondHelp;
        } else if (tokens[1] == "remove_condition") {
                return removeCondHelp;
        } else if (tokens[1] == "list_conditions") {
                return listCondHelp;
        } else if (tokens[1] == "probe") {
                return probeHelp;
        } else if (tokens[1] == "cont") {
                return contHelp;
        } else if (tokens[1] == "step") {
                return stepHelp;
        } else if (tokens[1] == "break") {
                return breakHelp;
        } else if (tokens[1] == "breaked") {
                return breakedHelp;
        } else if (tokens[1] == "disasm") {
                return disasmHelp;
        } else {
                return unknownHelp;
        }
}

vector<string> Debugger::Cmd::getBreakPointIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getBreakPoints(),
                [](auto& bp) { return strCat("bp#", bp.getId()); }));
}
vector<string> Debugger::Cmd::getWatchPointIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getWatchPoints(),
                [](auto& w) { return strCat("wp#", w->getId()); }));
}
vector<string> Debugger::Cmd::getConditionIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getConditions(),
                [](auto& c) { return strCat("cond#", c.getId()); }));
}

void Debugger::Cmd::tabCompletion(vector<string>& tokens) const
{
        static const char* const singleArgCmds[] = {
                "list", "step", "cont", "break", "breaked",
                "list_bp", "list_watchpoints", "list_conditions",
        };
        static const char* const debuggableArgCmds[] = {
                "desc", "size", "read", "read_block",
                "write", "write_block",
        };
        static const char* const otherCmds[] = {
                "disasm", "set_bp", "remove_bp", "set_watchpoint",
                "remove_watchpoint", "set_condition", "remove_condition",
                "probe",
        };
        switch (tokens.size()) {
        case 2: {
                completeString(tokens, concat(singleArgCmds, debuggableArgCmds, otherCmds));
                break;
        }
        case 3:
                if (!contains(singleArgCmds, tokens[1])) {
                        // this command takes (an) argument(s)
                        if (contains(debuggableArgCmds, tokens[1])) {
                                // it takes a debuggable here
                                completeString(tokens, view::keys(debugger().debuggables));
                        } else if (tokens[1] == "remove_bp") {
                                // this one takes a bp id
                                completeString(tokens, getBreakPointIds());
                        } else if (tokens[1] == "remove_watchpoint") {
                                // this one takes a wp id
                                completeString(tokens, getWatchPointIds());
                        } else if (tokens[1] == "remove_condition") {
                                // this one takes a cond id
                                completeString(tokens, getConditionIds());
                        } else if (tokens[1] == "set_watchpoint") {
                                static const char* const types[] = {
                                        "write_io", "write_mem",
                                        "read_io", "read_mem",
                                };
                                completeString(tokens, types);
                        } else if (tokens[1] == "probe") {
                                static const char* const subCmds[] = {
                                        "list", "desc", "read", "set_bp",
                                        "remove_bp", "list_bp",
                                };
                                completeString(tokens, subCmds);
                        }
                }
                break;
        case 4:
                if ((tokens[1] == "probe") &&
                    ((tokens[2] == "desc") || (tokens[2] == "read") ||
                     (tokens[2] == "set_bp"))) {
                        auto probeNames = to_vector(view::transform(
                                debugger().probes,
                                [](auto* p) { return p->getName(); }));
                        completeString(tokens, probeNames);
                }
                break;
        }
}

} // namespace openmsx